Many manufacturers of wear-resistant products need white corundum micropowder, but what is the role of white corundum micropowder, how is it composed, and the relationship between white corundum micropowder and alumina? Next, we will analyze the relationship between them in depth.
White corundum is a variety of ordinary abrasive corundum in abrasive products. It is made of aluminum oxide powder as the main raw material by high temperature smelting, and the content of Al2O3 is generally 97%-99%, which is white. White corundum has high hardness, the abrasive is not easy to dull, and its toughness is slightly inferior to that of brown corundum. The abrasive grains are easily broken under pressure to form new cutting edges. Because the abrasive hardness is higher than that of brown corundum, it is easy to cut into the workpiece material, and the abrasive grains have good self-sharpening performance, so white corundum abrasive tools have good cutting ability, which can reduce workpiece deformation and heat generation.
Therefore, white corundum abrasive is suitable for fine grinding, sharpening, thread grinding and other shape grinding, as well as for grinding workpieces that are easily deformed and burnt, such as fine grinding hardened steel, high-speed steel, high-carbon steel and thin-walled parts. White corundum has a micro-blade structure, suitable for mirror grinding. At the same time, white corundum also has the characteristics of acid and alkali corrosion resistance, high temperature resistance, good thermal stability, etc. It is widely used in precision casting, steel refractory, chemical refractory, special ceramics, ceramics for daily life, military industry, electronics and other high-tech fields.
The content of sodium oxide in ordinary white corundum is between 0.2-0.6%. Sodium oxide is a harmful impurity for white corundum. It forms β-Al2O3 with alumina in the molten state, and the amount of formation increases with the increase of sodium oxide content.
 |  |
With the rapid development of the market of high-end abrasives, electronic ceramics and high-end refractory materials, reducing the sodium content in white corundum has become an important research direction to improve the quality of white corundum. There are many methods for removing sodium from white corundum, such as removing sodium from raw materials, directly purchasing low-sodium industrial alumina raw materials, or removing sodium from high-sodium alumina raw materials, but these methods will increase the cost, so it is difficult to use corundum Production enterprises use it in batches.
